im not sure where it's at.But there is a man after you complete several chapters who is there that sells them.I hope this helped.

Improved DX member :i will get my revenge i see fighting on the walls unleash a million faces and one by one they fall just call it evil rain all is evil i am all i am all of meeeeee.I I I I am here we go buddy here we go buddy here we go here we go buddy here we go.